We're going to look into the possibility of adding more macro slots. Not something I can guarantee for 5.4, but we'll see what we can do.

On a larger scale, we'd really like to find ways to make the macro system smarter. Right now, it's not uncommon to see players with several different macros for raid markers, target switches, and so forth, and we'd like to look into some ways to address that. Again, not likely to see any major changes there in the short term, but we recognize that the macro system could use some updates. It's on our radar :)